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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4679be5cef5b102ac3a8f66caee08e28397caa260f999a98316131768eb8211c' 
  AND token = 'jj+KT51xVCERVztrAR6yk3oSKtixdHHQFA8b69d2XBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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