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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe30025d4695ad2ded2b9ba84d989508d3b65b75d3e2656033012f4c31c2b2c' 
  AND token = 'y9fPSggRn6WCzwBhx99rpPjxkrYaPU8gM3vLgKVZK9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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