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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c3b4ad543dd41ffc31960e0cf6f4b5f3520b079319a66f777909a812ed248fd' 
  AND token = 'cSSWFw2Z8e726X3sWmdoATSK6mFlmH83kAgy/YYly7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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