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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3fd2c2be1dfcf7d6d06d737f17d014c9a0b7af666194db7e0e8c605b95d0aa' 
  AND token = 'K6tyoKJkvHQoLiIAS0OZdR792BRFowuoKIeIX102SP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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