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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4438363e54244fb4c856cb4e155e96b69fca9109d14c13a03da8f65dd4638ca' 
  AND token = 'MAXJwjWtbggz4YKNSH7H6BuELhNJauEoAtm8gympnj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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