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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c162bcc7d0624a8c5af929ec1c6e2ed55cc8baa4e1f93079a53490a45bfe9f5' 
  AND token = 'GKV27lCKh6ZX2Sj7DFY2lhnGCrmqcbIkngnjgN9mhyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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