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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04edae9972b59970115d4287bb881a38e9d5db36c63114254cd7e2ade94c57d7' 
  AND token = 'BKrMudjLCN5lLwBnLN9E6uQw1Y249+NRFDzS3jcAykQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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