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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b271307860f4216654560ae32b8e3de4225ba2e66e2579ec8b35a5393b7ecf89' 
  AND token = '1Y351BF0SR2va8D/HnrjX79eT7Fc6lRuYKjyTTTA8Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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