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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6207b052fe42c21628de194120bc3ce79eca162a0d386a9238f1c5e4784df84a' 
  AND token = 'KIvKraUh8L7SXO1+vzCe9cT9miv63CTtdLRxr26D9tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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