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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4a7b9dcbf526fcd7b903c58901dbffc143e0d90bac4a8069b6a40c4a88c6eb' 
  AND token = 'YSXRB4tQSHAcUabr48htA2Rla3qCmMJb80WjX/vJl8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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