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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30adbd9021e4d36ca052b9d798aa472749e58546d7887b7c9cc9e593b8e300ee' 
  AND token = 'htB+zMHK9MabTax5tIvpY/Om3gEONRsx2POCzNRybcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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