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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da68a8d9df9fd5f943765cae0002b59f692ac9af0171954ebce1ed44e9eef813' 
  AND token = 'ZoIQnGaCUA+rDeYOAbkmZw3a7PGLaMrY/yj/cMmPjzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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