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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94003e05f0cc7e264775cc28693fac92110a7f38af0324a40ba77229a6726756' 
  AND token = 'mQZjgbuqGtiza3wj+thL7Sv9gqhcHgaOePxRAwsTrC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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