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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f6ff6380ee0c9f03318f286a4392dadc4d1373f007c6795e0e76adc0ef3db9' 
  AND token = 'MBkNLMOp4K0zSkr+jIsd818x24ug+QnAHtKlR/D2Upk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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