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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eec2b67449172522efe030268998d099be1100697b5a6359f6a20fb3fd1c433' 
  AND token = 'HU5oYzOsh0VQT4CK3YBZx86Iz9JtA31oTd3zI5YipiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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