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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524c7696074985503883597008b4da6a5d9ce7580da2ddaaab15cf9f7181c81d' 
  AND token = 'T3ZOKoRdJjBbC6ZQWe/jsNJTIJ10XzubipECBHM6sYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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