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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d48f8432add0bb63ada7b50c6a1436f07ab354a193504628376fbfe200be74e' 
  AND token = 'J8m5kkUczuyZDJTphpiZx/Ca5cF8N6HZAVsYmx4ijxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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