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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a54ea88a6779a3f48ea3e035d46cc0053af214f04d817f001b3880483bd70927' 
  AND token = 'ecLWeceZUG1xi3Znj0eWCMF7dK1kNuG4YLh8N3s38WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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