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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4698df38d90c0c85410ad6428e3c2de00aa432653de2962115f83e7cd7cb0b5' 
  AND token = 'KaefSgdZeltu+wndrMHP3j3KqziFv6sRnfv9ujS4Hg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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