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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1739ee5d2bf2b6649446d9c38e77884a5b46a87ce6a13ad774e427fbcdc94822' 
  AND token = 'a6XrqoE7hLxFuevQd3rwEXQ2OF6xVZXXMCKCAqJVYUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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