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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d215d9aede6d6760f5c94b29d23592b04c9e7801bfa8491864ebdd8b716a60a' 
  AND token = 'fh+eb113/TS5QLLMEJtIJxyYq/MzFKAJfR7FyM5TpdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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