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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a675372d8354994b3cd1ece499447de234976137d34a06654e35b45f114251' 
  AND token = 'tDR8ghjUdblMh+19pVppXvX8vMLhJR4kMzWFaDGRiNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}