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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e56685a41e211d293ac2bb58ba903dd2c20e54a944135f42af77b88795ea1e' 
  AND token = 'PlzIrHZL+/mnSaZLtE16ccTaL/WETsd5OYiDh/xuB3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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