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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d407bc40d78e201a4cbb23b6f24beb12da17d2d9e3ab007848d8886dfc1076' 
  AND token = 'DBM6WirvnCX7DQ38kL08jp478V9iKG/B956WaxGo5H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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