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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfcc5fd7ccc020639ad6c62bd6dc88d2089a687733162b24e9eebe5f0fbf4e5' 
  AND token = 'txXIYiZMaQpnF+j7e82hcvkuQFA7LwMf3yJ3DUc1BKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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