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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42ba6a233062d82d849a6eff6a03f3603dd48c871a5a9fe5961a74ee98defab' 
  AND token = '1719oyEhJAqtmeCS1jLbufH4OqiX+76OkG28OO8rJuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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