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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8576f126cb5b1f499143f0d02990b1d544c9d2a8ed74c644166b6030c9881e69' 
  AND token = 'm39CgRf8X720onHWlLkLhrtRYGNX0w651sZwBKfcA00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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