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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29720e3c92b39583b7632a0f3551e089ed3ea77fe54a1a76ae23d86a829d9ca' 
  AND token = 'c2NTug/JgJq+KcR3ILvMSPau5+HZqwSn4up62NDIcRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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