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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aeb1e7d71b353cea2994877f132d17d222f9a35cf87ea5d4103299b3af802d0' 
  AND token = 'h3R5MvWzU3xRMF1VhYiBAOS0hMSRGoRatfKs+BzwKyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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