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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15374a50b68e02c4b89280144363ad07c57fcc799ce5be31b9c269b1bedc465e' 
  AND token = 'Ckh6zmszkdxt1UQvU35peJKCfmRGM3ja/Wwpdrv5XMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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