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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be0568e3abe49893c907f85881f5516eb4e74d909bf7deffde1836b9981d2f6' 
  AND token = '1AdV43grApLoY4CEP5V1hjcHps20v0HIOk6fp7UKGmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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