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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7f9b16b4f8be2300f9940b6c172cffa7912a1bab7105fead667787db5525e8' 
  AND token = '6OA0d7fsas4SVtFNvbAqhfUTldv2CPWrs46EnpI0jn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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