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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7787241832daebcab5a823aa9b23b45687819ffd277e1ec302e99e7e0e6e7ebf' 
  AND token = 'p6HdRA5PjAVIg6sP/ziGndf0/TcEu2zGu5MeCyC34Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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