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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e535eb10c2fc1e60b0b56c8df8aa537bea10ffbaae4cf9e9bfcfb5ea88a3f9d' 
  AND token = 'pAPmtPgjfQiHtwQ5WlAHs2+lprhjxx+Oo85wWG0/xAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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