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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95edd59e930b718678813f1937847ec4841d42763ad9570a7dee0042aa40b5c3' 
  AND token = 'lUs6Hru3t3eWasoH/DozTntrRGRXHT95T/zGq1YDM7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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