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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058711e605780be1f42309bed9d1731d428b0a285b912825ee9f7a72966a92f6' 
  AND token = 'fU/GNxS+l/yyOujbpERF7MuWnxIwY0IpJ9Ifla6w/CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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