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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ff3dde8ca053f9274fe62320ecde5b7257d1134a9121a73d53dd4e3f7f4084' 
  AND token = 'EW86KEvAQTY6gUGHrQU4F0oRiN/jmrU5xC0G6aefPQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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