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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfde447a2dc6e62a62ec622279392e4e6bae068f23eca6c2f1d1c7ff9d5eac28' 
  AND token = 'rfHu9BaOlwx83I0WForEfe3cu8Iady8b2XZoqPa+iko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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