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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba47ece8e7e2a42ad0d010e45e30e3da9c0c2751d103394d864ae74e81b13f4' 
  AND token = 'aY6CoqPYWKWcTMPkCtTIFWwDwe8JWyGNJfT/D/7RTlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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