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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6015ec7454c7e2f5d5067713c5c610149c4823994c8c7f33ede5b78de614e1b5' 
  AND token = '6fJAPZnxzKojA+orLIzngd8PrVZrCSDX793YJ7s7Gfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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