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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d349c60be543b1f6c140529572c22bab1dd1b89bb8fd6d2ca6e30b763595926' 
  AND token = '6cHSk0e5j7y2+dqtm2p0SiOxH/K93nc0z0+ORLQFPm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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