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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41713a3988fa50349deb2b006e5d52f9956a4f963c918343c966de030ab11272' 
  AND token = 'LrsoGgg4b3Wu8OpBAeG6oHJ5e3ciSdG6W2/yv3rKATQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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