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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430c0d803029cdd4efbe9112103bc9eaa5ce2ca08a1484ac33e64d17ae7894f1' 
  AND token = 'Rkq4jOwArE8Lls6vEMd98Os6arZ8Zi8ttI8AsCleIzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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