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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9973409891014e39cabc50b663f8db7ccb77a7b0133162e3aa7de13d05f868c5' 
  AND token = 'PBpKe7BPBemL/JqfaGeaXQcNjqVQ80hDO/51cy3N68U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00195

JSON explain

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