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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06fbdb51bd914cdea8aaa54a5247aa2d003da70cc4ae95b8b85f2e9f0d81e60' 
  AND token = 'N6Q/4ashrS+RuEPDqVmsNV8Dkh3m6GRtmsqqrODaft8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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