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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09a22d82cfbb51114ad740104adc9f06b41cc0e796938a7e94622682e3be278' 
  AND token = 'AMgORzNuZn2/l37Sjx+tJTNFSYRALjz+sMIAUOUbYXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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