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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ffbac4cada28e15e4e233c24f7aef2cd0420df55d6b750c83f7ff7f8351313' 
  AND token = 'C8xYNkEdH6HfDHWo6M1WO6oPDw4wINTBk478vSfUufA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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