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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd4e2f714fa1bc2b64f019349fb98a07af003d8f89eabd345abfa8b026a7a30' 
  AND token = 'G3fiw6QFSi6T+zIXrChzpLWtUvYaFIZY9oJ9vCLU7bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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