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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9a817e89b674da41b3fff3c335d70ad44d43378c66ab5134ebdf471a41906c' 
  AND token = 'p3t7alWgoNPKm0dqJpTuj/xA1/skW0bbxusWYiZJzeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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