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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad73a935a1c5f1d9a39d5118624ec71954fbc935d3cb4f75cf46618433c57e6' 
  AND token = '7caQv5Kjnbu4ZoT0YUV9e82IPvIUeXMS0HyjDfRJcl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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