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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36e38ea205fcfd4747c4b4ca41af5757dbff8b75fdfdea6a767614eceaa4c5c' 
  AND token = 'SnH0C4n5muGOzzkZXouz+PwSpkINIqXnJW/qVr7odEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00252

JSON explain

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