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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84069a4e6b23e1064a90e0486c1ddfe2b6e3b5a7be1da66839f456d8b1c65870' 
  AND token = 'r+hug1SelmhjVzWjtLwN3ygXVup07VqL59Zn0tdiy/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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