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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d41abff6587ecc06818108273df3c407d517085e88d03213fe16b74079a5d1e' 
  AND token = '4Nt0jMsaHiS8D/1DIqosCMO1uNYZda1/cTQUE02O2WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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