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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7844b30128392dccb546f23e3793c89e472473d3c084948bb9cc5f8bda1064' 
  AND token = 'oQjx/CV3tOGON6UtjSinN7onFotLjfAhaGB9WhmB/kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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