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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91562b9e32499d617756db8074c97e8b47180ebf3c8461422ed99e79b76e29d5' 
  AND token = 'HymaVRLqO2wWpptM23+8k6fXB8cetvekVK+EeiEZXlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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