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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567c74f9ab993ab8c0e512e01b3539400b784f874314cd7fe807e42eb701089d' 
  AND token = 'KMiX8kdccipEWQDvREbQBmZAOFYw8Td2EG244aKf5Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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