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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4f8109c2ff1a9150cd4bb512aea67c76a52d90de317bccc134ddfe45e27880' 
  AND token = 'INgVexXCBK85Q69LKUpge3ei9jsZ4PLgcxJU4flNRp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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