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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53e08f583d463b985bd0d6966e89411b86c0f9e1ddbd365c6befebe49273046' 
  AND token = '4eul3ALSL7AX+lHmKXlUbJTP6qN6lGZQEZfdnts64g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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