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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6729102d306c03e614a4208dd686723b7a75a3044a5add800153882d955e66' 
  AND token = 'PT0ganwDCdawae82J2DNfb3nOWN+5a2mXyM//qU/RCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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